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A Modified Co-precipitation Method to Prepare Cu/ZnO/Al2O3 Catalyst and Its Application in Low Temperature Water-gas Shift(LT-WGS)Reaction

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Journal of Wuhan University of Technology(Materials Science) 2018年第4期33卷 876-883页

作者：许龙龙 PENG Dong LIU Wenhui FENG Yimin HOU Yanan LI Xiongjian 黄驰 Tianhua chemical Branch Xi'an Sunward Aeromat Co.Ltd.Xi'an 710065China sanjiang chemical factory of cssg Yuanan 444200China College of Chemistry and Molecular Scienees Wuhan UniversityWuhan 430072China

A modified co-precipitation method for the production of Cu/ZnO/Al2O3 complex was studied. The modification was that part of Al was introduced by adding Al^（3＋） into Cu^（2＋）/Zn^（2＋） solution, and the rest of Al was added after co-precipitation step in the form of pseudo-boehmite. The prepared samples were characterized by different techniques such as X-ray diffraction, N2 adsorption, H2-N2O titration, temperature programmed reduction and scanning electron microscopy. X-ray diffraction characterizations revealed that Al^（3＋） can be doped in aurichalcite lattice, and the maximum doping amount of Al^（3＋） was 5.0% of total Cu and Zn atoms. The Cu/ZnO/Al2O3 sample produced by the modified method, in which co-precipitated Al^（3＋） was 2.5% of total Cu and Zn atoms showed much better activity and stability in water-gas shift reaction than commercial sample. The high Cu surface area（26.1 m^2/g） obtained by decompositon of doped aurichalcite is believed to be responsible for the activity enhancement. The stability was enhanced mainly because of the support effect of γ-Al2O3, which was decomposed from pseudo-boehmite in the calcination step.

关键词： Cu/ZnO/Al2O3 co-precipitation water-gas shift aurichalcite

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Influence of V/P Ratio on the Catalytic Performance of VPO/SiO_2 Catalysts for Ammoxidation of Chloro-Substituted Toluenes

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Wuhan University Journal of Natural Sciences 2019年第1期24卷 23-29页

作者： DONG Yanling XU Longlong ZHANG Zhenguo LIU Wenhui LI Xiongjian ZHONG Yalan HUANG Chi State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Tianhua chemical Branch Xi'an Sunward Aeromat Co.Ltd. sanjiang chemical factory of cssg College of Chemistry and Molecular Sciences Wuhan University

A series of vanadium phosphate oxide(VPO) catalysts supported on silica(VPO/Si O2) with various mole ratios of V/P(nV:nP=1:0.8-1:3) were prepared through impregnation method. The catalytic activity was evaluated by ammoxidation reactions of several kinds of chloro-substituted toluenes(CT) in a fixed-bed reactor. The catalyst presented the best performance when nV:nP is 1:1.6. The prepared catalysts were characterized by N2 adsorption, hydrogen temperature programmed reduction(TPR) and ammonia temperature programmed desorption(TPD) and etc. The results reveal that P can decrease the bonding energy of V=O and increase the mobility of lattice oxygen which was beneficial for the improvement of the catalysts, while too much P can greatly decrease the average oxidation number of V which leads to deactivation of the catalysts. The surface acidity of the VPO/Si O2 catalysts is affected by nV:nP and the catalyst had the highest surface acidity when nV:nP is 1:1.6. The selectivity of catalysts is proportional to the surface acidity when nV:nP is lower than 1:3.0.

关键词： ammoxidation VPO/SiO2 catalyst substituted toluenes substituted benzonitriles

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